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Paleomagnetic investigation in the Deseado Massif, southern Patagonia, suggests that Triassic sedimentary rocks carry a latest Triassic to Jurassic remagnetization and that earliest Jurassic plutonic complexes carry a reversed polarity magnetization of thermoremanent origin. Despite uncertainties in the timing of the observed remanence in the Triassic rocks and the lack of paleohorizontal control on the plutonic complexes, comparison of the derived pole positions with the most reliable Late Triassic-Jurassic apparent polar wander paths indicates that the study areas underwent significant clockwise vertical-axis rotation. In contrast, paleomagnetic results from mid-Cretaceous rocks in the region indicate no rotation. The observed crustal rotations in the Deseado Massif are thus bracketed to have occurred between Jurassic and Early Cretaceous times, documenting southern Patagonian deformation during the breakup of Western Gondwana and then enlarging the regional record of clockwise rotations associated with this event. These results suggest a more complex than previously supposed tectonic evolution of this part of South America. © 2008 Elsevier B.V. All rights reserved.


Documento: Artículo
Título:Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana
Autor:Somoza, R.; Vizán, H.; Taylor, G.K.
Filiación:CONICET, Argentina
Departamento de Ciencias Geológicas, FCEyN, Universidad de Buenos Aires, Argentina
School of Earth, Ocean and Environmental Sciences, University of Plymouth, United Kingdom
Palabras clave:Gondwana breakup; Jurassic; Paleomagnetism; Patagonia; apparent polar wander path; continental breakup; crustal structure; deformation; Gondwana; Jurassic; paleomagnetism; remagnetization; sedimentary rock; tectonic evolution; tectonic structure; Triassic; Patagonia; South America
Página de inicio:178
Página de fin:185
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics


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---------- APA ----------
Somoza, R., Vizán, H. & Taylor, G.K. (2008) . Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana. Tectonophysics, 460(1-4), 178-185.
---------- CHICAGO ----------
Somoza, R., Vizán, H., Taylor, G.K. "Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana" . Tectonophysics 460, no. 1-4 (2008) : 178-185.
---------- MLA ----------
Somoza, R., Vizán, H., Taylor, G.K. "Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana" . Tectonophysics, vol. 460, no. 1-4, 2008, pp. 178-185.
---------- VANCOUVER ----------
Somoza, R., Vizán, H., Taylor, G.K. Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana. Tectonophysics. 2008;460(1-4):178-185.